Which to use first, serum or serum

Use serum first. Because the essence is also known as the essence, the essence contains trace elements, collagen, serum, and its functions include anti-aging, anti-wrinkle, moisturizing, whitening, spot removal and so on. It is suitable for normal skin type. It is a little thicker than the essence of essence, but because it is a texture separated from water and oil, the absorption will be better. It is suitable for use before lotion and after cleansing.